Yamaha XF50W Service Manual page 182

®-~ ®-~ ®-~
ODtE
VALVES AND VALVE SPRINGS
3. Eliminate:
4. Check:
5. Measure:
6. Measure:
\J45° \J45° \J45°
NOTE:
•
5-25
ENG
• carbon deposits
(from the valve face and valve seat)
• valve face
Pitting/wear -* Grind the valve face.
• valve stem end
Mushroom shape or diameter larger than
the body of the valve stem
valve.
• valve margin thickness a
Out of specification -*
Valve margin thickness
0.9~1.1mm(0.0354~0.0433in)
• valve stem runout
Out of specification -*
If the valve is removed or replaced, always
replace the oil seal.
Valve stem runout
0.01 mm(0.0004 in)
m
%
-* Replace the
Replace the valve.
Replace the valve.